CVE-2021-21237

Publication date 15 January 2021

Last updated 21 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Git LFS is a command line extension for managing large files with Git. On Windows, if Git LFS operates on a malicious repository with a git.bat or git.exe file in the current directory, that program would be executed, permitting the attacker to execute arbitrary code. This does not affect Unix systems. This is the result of an incomplete fix for CVE-2020-27955. This issue occurs because on Windows, Go includes (and prefers) the current directory when the name of a command run does not contain a directory separator. Other than avoiding untrusted repositories or using a different operating system, there is no workaround. This is fixed in v2.13.2.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
git-lfs	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

john-breton

This is a Windows-only vulnerability that isn't replicatable on Ubuntu.

Severity score breakdown

Parameter	Value
Base score	7.2 · High
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	Required
Scope	Changed
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N